1 #[cfg(feature = "http1")]
2 use bytes::BytesMut;
3 use http::header::CONTENT_LENGTH;
4 use http::header::{HeaderValue, ValueIter};
5 use http::HeaderMap;
6 #[cfg(all(feature = "http2", feature = "client"))]
7 use http::Method;
8
9 #[cfg(feature = "http1")]
connection_keep_alive(value: &HeaderValue) -> bool10 pub(super) fn connection_keep_alive(value: &HeaderValue) -> bool {
11 connection_has(value, "keep-alive")
12 }
13
14 #[cfg(feature = "http1")]
connection_close(value: &HeaderValue) -> bool15 pub(super) fn connection_close(value: &HeaderValue) -> bool {
16 connection_has(value, "close")
17 }
18
19 #[cfg(feature = "http1")]
connection_has(value: &HeaderValue, needle: &str) -> bool20 fn connection_has(value: &HeaderValue, needle: &str) -> bool {
21 if let Ok(s) = value.to_str() {
22 for val in s.split(',') {
23 if val.trim().eq_ignore_ascii_case(needle) {
24 return true;
25 }
26 }
27 }
28 false
29 }
30
31 #[cfg(all(feature = "http1", feature = "server"))]
content_length_parse(value: &HeaderValue) -> Option<u64>32 pub(super) fn content_length_parse(value: &HeaderValue) -> Option<u64> {
33 from_digits(value.as_bytes())
34 }
35
content_length_parse_all(headers: &HeaderMap) -> Option<u64>36 pub(super) fn content_length_parse_all(headers: &HeaderMap) -> Option<u64> {
37 content_length_parse_all_values(headers.get_all(CONTENT_LENGTH).into_iter())
38 }
39
content_length_parse_all_values(values: ValueIter<'_, HeaderValue>) -> Option<u64>40 pub(super) fn content_length_parse_all_values(values: ValueIter<'_, HeaderValue>) -> Option<u64> {
41 // If multiple Content-Length headers were sent, everything can still
42 // be alright if they all contain the same value, and all parse
43 // correctly. If not, then it's an error.
44
45 let mut content_length: Option<u64> = None;
46 for h in values {
47 if let Ok(line) = h.to_str() {
48 for v in line.split(',') {
49 if let Some(n) = from_digits(v.trim().as_bytes()) {
50 if content_length.is_none() {
51 content_length = Some(n)
52 } else if content_length != Some(n) {
53 return None;
54 }
55 } else {
56 return None
57 }
58 }
59 } else {
60 return None
61 }
62 }
63
64 return content_length
65 }
66
from_digits(bytes: &[u8]) -> Option<u64>67 fn from_digits(bytes: &[u8]) -> Option<u64> {
68 // cannot use FromStr for u64, since it allows a signed prefix
69 let mut result = 0u64;
70 const RADIX: u64 = 10;
71
72 if bytes.is_empty() {
73 return None;
74 }
75
76 for &b in bytes {
77 // can't use char::to_digit, since we haven't verified these bytes
78 // are utf-8.
79 match b {
80 b'0'..=b'9' => {
81 result = result.checked_mul(RADIX)?;
82 result = result.checked_add((b - b'0') as u64)?;
83 },
84 _ => {
85 // not a DIGIT, get outta here!
86 return None;
87 }
88 }
89 }
90
91 Some(result)
92 }
93
94 #[cfg(all(feature = "http2", feature = "client"))]
method_has_defined_payload_semantics(method: &Method) -> bool95 pub(super) fn method_has_defined_payload_semantics(method: &Method) -> bool {
96 match *method {
97 Method::GET | Method::HEAD | Method::DELETE | Method::CONNECT => false,
98 _ => true,
99 }
100 }
101
102 #[cfg(feature = "http2")]
set_content_length_if_missing(headers: &mut HeaderMap, len: u64)103 pub(super) fn set_content_length_if_missing(headers: &mut HeaderMap, len: u64) {
104 headers
105 .entry(CONTENT_LENGTH)
106 .or_insert_with(|| HeaderValue::from(len));
107 }
108
109 #[cfg(feature = "http1")]
transfer_encoding_is_chunked(headers: &HeaderMap) -> bool110 pub(super) fn transfer_encoding_is_chunked(headers: &HeaderMap) -> bool {
111 is_chunked(headers.get_all(http::header::TRANSFER_ENCODING).into_iter())
112 }
113
114 #[cfg(feature = "http1")]
is_chunked(mut encodings: ValueIter<'_, HeaderValue>) -> bool115 pub(super) fn is_chunked(mut encodings: ValueIter<'_, HeaderValue>) -> bool {
116 // chunked must always be the last encoding, according to spec
117 if let Some(line) = encodings.next_back() {
118 return is_chunked_(line);
119 }
120
121 false
122 }
123
124 #[cfg(feature = "http1")]
is_chunked_(value: &HeaderValue) -> bool125 pub(super) fn is_chunked_(value: &HeaderValue) -> bool {
126 // chunked must always be the last encoding, according to spec
127 if let Ok(s) = value.to_str() {
128 if let Some(encoding) = s.rsplit(',').next() {
129 return encoding.trim().eq_ignore_ascii_case("chunked");
130 }
131 }
132
133 false
134 }
135
136 #[cfg(feature = "http1")]
add_chunked(mut entry: http::header::OccupiedEntry<'_, HeaderValue>)137 pub(super) fn add_chunked(mut entry: http::header::OccupiedEntry<'_, HeaderValue>) {
138 const CHUNKED: &str = "chunked";
139
140 if let Some(line) = entry.iter_mut().next_back() {
141 // + 2 for ", "
142 let new_cap = line.as_bytes().len() + CHUNKED.len() + 2;
143 let mut buf = BytesMut::with_capacity(new_cap);
144 buf.extend_from_slice(line.as_bytes());
145 buf.extend_from_slice(b", ");
146 buf.extend_from_slice(CHUNKED.as_bytes());
147
148 *line = HeaderValue::from_maybe_shared(buf.freeze())
149 .expect("original header value plus ascii is valid");
150 return;
151 }
152
153 entry.insert(HeaderValue::from_static(CHUNKED));
154 }
155